Electrical Technicians Assessment Test with Answers

For Answers: Highlight the last line of any question.

1. What is the unit of electrical resistance?

A) Ampere

B) Volt

C) Ohm

D) Watt

Answer: C) Ohm

2. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?

A) Faraday's Law

B) Coulomb's Law

C) Ohm's Law

D) Kirchhoff's Law

Answer: C) Ohm's Law

3. What type of current is supplied by a battery?

A) Alternating Current (AC)

B) Direct Current (DC)

C) Pulsating Current

D) Three-phase Current

Answer: B) Direct Current (DC)

 

4. Which component is used to store electrical energy in an electric field?

A) Resistor

B) Capacitor

C) Inductor

D) Transformer

Answer: B) Capacitor

5. Which of the following is a semiconductor device?

A) Resistor

B) Transformer

C) Diode

D) Inductor

Answer: C) Diode

6. What device is used to measure electrical current in a circuit?

A) Voltmeter

B) Ammeter

C) Ohmmeter

D) Wattmeter

Answer: B) Ammeter

7. What is the primary purpose of a circuit breaker?

A) To convert AC to DC

B) To step down voltage levels

C) To interrupt excessive current flow

D) To store electrical energy

Answer: C) To interrupt excessive current flow

 

 

 

8. Which color wire is typically used for grounding in a standard electrical system?

A) Black

B) Red

C) Green

D) Blue

Answer: C) Green

9. What personal protective equipment (PPE) is essential when working on live electrical circuits particularly on LV?

A) Safety goggles

B) Insulated gloves

C) Hard hat

D) Steel-toed boots

Answer: B) Insulated gloves

10. What is the main purpose of a relay in an electrical circuit?

A) To amplify signals

B) To open or close a circuit electromechanically or electronically

C) To provide resistance

D) To store charge

Answer: B) To open or close a circuit electromechanically or electronically

11. Which instrument would you use to detect a short circuit in a wire?

A) Voltmeter

B) Oscilloscope

C) Multimeter

D) Wattmeter

Answer: C) Multimeter

 

 

 

12. What happens if you connect a capacitor in parallel with a resistor in an AC circuit?

A) The total impedance increases

B) The total impedance decreases

C) The total resistance becomes zero

D) The total capacitance becomes zero

Answer: B) The total impedance decreases

13. What is the purpose of a transformer?

A) To store electrical energy

B) To measure electrical energy

C) To step up or step down voltage levels

D) To convert AC to DC

Answer: C) To step up or step down voltage levels

14. Which component is used to protect circuits from voltage spikes?

A) Inductor

B) Varistor

C) Capacitor

D) Resistor

Answer: B) Varistor

15. In a three-phase electrical system, how many degrees apart are the phases typically?

A) 60 degrees

B) 90 degrees

C) 120 degrees

D) 180 degrees

Answer: C) 120 degrees

 

 

 

16. Which device converts electrical energy into mechanical energy?

A) Transformer

B) Generator

C) Motor

D) Capacitor

Answer: C) Motor

17. What is the primary function of an inductor in a circuit?

A) To store electrical energy in an electric field

B) To store electrical energy in a magnetic field

C) To resist the flow of current

D) To amplify signals

Answer: B) To store electrical energy in a magnetic field

18. In an AC circuit, what does the power factor represent?

A) The ratio of real power to apparent power

B) The ratio of apparent power to real power

C) The total resistance in the circuit

D) The total reactance in the circuit

Answer: A) The ratio of real power to apparent power

19. What is the typical voltage of a standard single phase in Pakistan?

A) 120 volts

B) 240 volts

C) 110 volts

D) 220 volts

Answer: D) 220 volts

 

 

 

20. Which type of fuse is used for protecting sensitive electronic devices?

A) Slow-blow fuse

B) Fast-acting fuse

C) High-voltage fuse

D) Thermal fuse

Answer: B) Fast-acting fuse

21. What is the purpose of a GFCI (Ground Fault Circuit Interrupter)?

A) To protect against overvoltage

B) To protect against short circuits

C) To protect against ground faults

D) To protect against high current

Answer: C) To protect against ground faults

22.  What is the recommended minimum safe distance from power lines for conducting electrical work?

A) 1 foot

B) 3 feet

C) 10 feet

D) 15 feet

Answer: C) 10 feet

23. Which of the following is a key practice to prevent electrical shock when working on a live circuit?

A) Wearing rubber-soled shoes

B) Using insulated tools

C) Standing on a wooden platform

D) Wearing a hard hat

Answer: B) Using insulated tools

 

 

24. What does the term "lockout/tagout" refer to in electrical safety?

A) A method for shutting down equipment

B) A procedure to ensure machines are properly shut off and not restarted until maintenance is completed

C) A type of electrical fuse

D) A way to measure electrical resistance

Answer: B) A procedure to ensure machines are properly shut off and not restarted until maintenance is completed

25. In a three-phase electrical system, what is the phase difference between each phase?

A) 45 degrees

B) 60 degrees

C) 90 degrees

D) 120 degrees

Answer: D) 120 degrees

26. What is the role of a rectifier in an electrical circuit?

A) To convert AC to DC

B) To convert DC to AC

C) To step up voltage

D) To step down voltage

Answer: A) To convert AC to DC

27. Which type of transformer is used to connect circuits with different voltage levels?

A) Auto-transformer

B) Step-up transformer

C) Step-down transformer

D) Isolation transformer

Answer: D) Isolation transformer

 

 

28. What is the function of a circuit breaker?

A) To amplify signals

B) To step up voltage

C) To open a circuit automatically under overload or short circuit conditions

D) To store electrical energy

Answer: C) To open a circuit automatically under overload or short circuit conditions

29. Which of the following is used to measure the electrical power consumption of a circuit?

A) Ammeter

B) Voltmeter

C) Wattmeter

D) Ohmmeter

Answer: C) Wattmeter

30. What is the purpose of an electrical ground?

A) To reduce voltage

B) To increase current

C) To provide a safe path for electricity to dissipate into the earth

D) To store electrical charge

Answer: C) To provide a safe path for electricity to dissipate into the earth